Hi Al,
Thanks for your help. I have downloaded QE DEsign demo and am currently
having fun playing with poles and zeros, its amazing what they do when you
think about it :-) Cheers for the advice about the books too,
David
>From: Al Clark <aclark at danvillesignal.com>
>Reply-To: music-dsp at shoko.calarts.edu>To: music-dsp at shoko.calarts.edu>Subject: Re: [music-dsp] Design of IIR Filters
>Date: Thu, 08 Jan 2004 10:39:36 -0600
>>At 10:07 AM 1/8/2004, you wrote:
>>Hi List,
>>>>I was wondering if anyone had some information on the Design of IIR
>>Filters. Anyone got any links to an article or tutorial on a simple method
>>of IIR design? I'm wanting to learn the math. For example, if I have my
>>Filter specs. (Sampling rate, cutoff frequency etc..) what is the best way
>>to arrive at the transfer function and coefficients? Anyone got any
>>experience of doing this, a tried and tested approach that gives good
>>results??
>>>>Thanks for any help,
>>>>David
>>Most introductory DSP books cover this topic. One of the best written
>primers is Rick Lyons' Understanding Digital Signal Processing. Digital
>Audio Signal Processing by Udo Zolzer and Introduction to Signal processing
>by Orfanidis are good books that have an audio bent.
>>You should be aware that different IIR filter topologies will have better
>performance. There are papers that discuss these issues, many in the AES
>Journal. Math precision is very important for high performance IIR filters.
>>You can use a bilinear transform or other method to convert an s plane
>filter to a z-plane filter. It is certainly doable by hand calculation, but
>most of us use a filter program instead. I like QEDesign, a program from
>Momentum Data Systems (www.mds.com).
>>>>>Al Clark
>Danville Signal Processing, Inc.
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